P0115 · blink 22 – Engine coolant temperature sensor circuit

System: Engine - ECT
Dashboard light: High coolant temperature light · Check engine light (MIL) · Low coolant temperature light (blue)
Check-engine blink code: 22
Applies to: 1SZ-FE (by platform)
Description: Engine coolant temperature sensor circuit
Possible causes: Trouble area: 1.Open or short in coolant temperature sensor circuit 2.Coolant temperature sensor 3.Engine computer (ECM)
What to check: Checking points: 1.Check sensor connector and wiring 2.Check sensor resistance cold and hot 3.Replace sensor if out of range
Confidence: medium (Toyota Echo 1999–2002 factory diagnostics, same XP10 platform; not confirmed on JDM 1SZ-FE)

From the factory service material. Clear the code and test-drive to confirm it returns. Search all fault codes · Common problems · Warning lights